链接FORTRAN和C ++对象文件 [英] Linking FORTRAN and C++ objects files

问题描述

我打算从FORTRAN调用一个C ++函数，为此我使用ISO_C_Binding模块。使用命令压缩FORTRAN主文件和C ++函数后

  gfortran -c mlp8.f90 
 
 g ++ -c mean_cpp.cc 
  

这将创建对象文件，但在链接阶段，成员我将使用命令

  g ++ mlp8.o mean_cpp.o -o main -lgfortran 
 
 code> 

即，使用C ++编译器链接到FORTRAN库，但它会给出错误，如$ / b
$ b $ $ $ $ $ $ $ $ $ $ $ $ $ / $ Cy $ c $ / cygwin -b20 / H-i586-cygwin32 / i586-win32 / bin / ld：
无法打开-lgfortran：没有这样的文件或目录

Collect2：ld返回1退出状态


所以我认为主要的问题是 g ++ 链接器无法链接到FORTRAN库，所以可能是我需要在链接选项中包含一些路径，或者可能需要在 g ++ 编译器中进行一些设置，我不知道如何执行此操作，所以请帮忙解决这个问题。

解决方案

您应该找到 libgfortran。* c $ c> locate find / -namelibgfortran。*;或以windows-way Win + g ，F3 或任何文件管理器），记录它所在的路径并执行

  g ++ mlp8。 o其中，PATH_RECORDED是路径。
 
 
 
试试这个lib列表（使用-v选项从我的mingw gfortran中获得）
  g ++ mlp8.o mean_cpp.o -o main -LPATH_RECORDED -lgfortran -lmingw32 -lgcc_s -lgcc -lmoldname -lmingwex -lmsvcrt 
  
 
I am going to call a C++ function from FORTRAN, for which I am using ISO_C_Binding module. After compaction of the FORTRAN main file and C++ function with commands
 gfortran -c mlp8.f90

 g++ -c mean_cpp.cc
Which will create the objects files but in the linking phase as suggested by some members I am going to use the commands 
 g++ mlp8.o mean_cpp.o -o main –lgfortran
I.e. using C++ compiler with linking to FORTRAN libraries but it gives error like 
 /Cygnus/cygwin-b20/H-i586-cygwin32/i586-win32/bin/ld: 
   cannot open –lgfortran: No such a file or directory 

 Collect2:ld return 1 exit status 
So I think the main problem is that the g++ linker can not link with the FORTRAN libraries, so may be I need to include some path in the linking option or may be I need to do some setting in the g++ complier, which I don’t know how to do this, so please help to sort out this problem. 
解决方案
You should find file libgfortran.* (e.g. with locate of find / -name "libgfortran.*"; or in windows-way Win+g, F3 or any file manager), record the path where it is and do
 g++ mlp8.o mean_cpp.o -o main -LPATH_RECORDED –lgfortran
where PATH_RECORDED is the path.

Try this lib list (got it from my mingw gfortran with -v option)
 g++ mlp8.o mean_cpp.o -o main -LPATH_RECORDED –lgfortran -lmingw32 -lgcc_s -lgcc -lmoldname  -lmingwex -lmsvcrt


                        
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